I suppose that depends on the individual, really. If you're content with never learning the mysteries of this strange world we've all been pulled into, then no, it's doesn't much matter where these Pokemon come from. But I doubt they're unconnected. After all, I've never seen someone on this network who claimed to be from this world originally. They may be out there, but if they are, they're very rare. There's something that makes us different from the natives.